<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="item in cartList" :key="item.id">
          <li class="cart-list-con1">
            <input
              type="checkbox"
              name="chk_list"
              :checked="item.isChecked"
              @input="singleChange(item.skuId, $event.target.checked ? 1 : 0)"
            />
          </li>
          <li class="cart-list-con2">
            <img :src="item.imgUrl" />
            <div class="item-msg">
              {{ item.skuName }}
            </div>
          </li>
          <li class="cart-list-con3">
            <div class="item-txt">语音升级款</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ item.cartPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a
              href="javascript:void(0)"
              class="mins"
              @click="changeSkuNum(item.skuNum - 1, item.skuId)"
              >-</a
            >
            <input
              autocomplete="off"
              type="text"
              :value="item.skuNum"
              minnum="1"
              class="itxt"
              @change="changeSkuNum(+$event.target.value, item.skuId)"
            />
            <a
              href="javascript:void(0)"
              class="plus"
              @click="changeSkuNum(item.skuNum + 1, item.skuId)"
              >+</a
            >
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ item.skuNum * item.cartPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a
              @click="deleteSingle(item.skuId)"
              style="cursor: pointer"
              class="sindelet"
              >删除</a
            >
            <br />
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" v-model="allChecked" />
        <span>全选</span>
      </div>
      <div class="option">
        <a href="#none" @click="deleteAllCart">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">
          已选择 <span>{{ totalNum }}</span
          >件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ allPrice }}</i>
        </div>
        <div class="sumbtn">
          <a class="sum-btn" @click="$router.push('/trade')">结算</a>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {
  reqCartList,
  reqAddCartOrUpdataCart,
  deleteCartList,
  changeChecked,
  changeAllChecked,
  reqDeleteAllCart,
} from "@/api";
export default {
  name: "ShopCart",
  data() {
    return {
      cartList: [],
    };
  },
  mounted() {
    //1.初始化请求数据
    this.getShopCartList();
  },
  methods: {
    //1.封装一个请求购物车列表的函数
    async getShopCartList() {
      const result = await reqCartList();
      // console.log(result);
      this.cartList = result[0]?.cartInfoList || [];
    },

    //2.修改商品数量的事件回调
    async changeSkuNum(skuNum, skuId) {
      //接受的参数是已经计算后的数量

      //如果计算后的数量小于1 则不再做任何操作
      if (skuNum < 1) return;

      //因为skuNum是我们希望变成的数量,但是请求中要的是前后的差值数量
      //我们需要知道之前的数量,然后进行计算
      //我们只能通过当前的skuId找到当前商品原始的数量
      const nowSku = this.cartList.find((item) => {
        return item.skuId === skuId;
      });

      try {
        //发送请求 修改后台的数量
        await reqAddCartOrUpdataCart(skuId, skuNum - nowSku.skuNum);

        //如果成功则重新请求最新的数据
        this.getShopCartList();
      } catch (e) {
        alert(e.message);
      }
    },

    //3. 删除单个商品
    async deleteSingle(skuId) {
      try {
        await deleteCartList(skuId);
        //如果成功则重新请求最新的数据
        this.getShopCartList();
      } catch (e) {
        alert(e.message);
      }
    },

    //4. 修改单个isChecked状态
    async singleChange(skuId, isChecked) {
      try {
        await changeChecked(skuId, isChecked);
        //如果成功则重新请求最新的数据
        this.getShopCartList();
      } catch (e) {
        alert(e.message);
      }
    },

    //5. 删除所有选中商品
    async deleteAllCart() {
      try {
        //过滤得到所有选中商品的id组成的数组
        const skuIdList = this.cartList.reduce((p, c) => {
          c.isChecked === 1 ? p.push(c.skuId) : "";
          return p;
        }, []);
        await reqDeleteAllCart(skuIdList);

        //如果成功则重新请求最新的数据
        this.getShopCartList();
      } catch (e) {
        alert(e.message);
      }
    },
  },
  computed: {
    allPrice() {
      return this.cartList
        .filter((item) => item.isChecked === 1)
        .reduce((p, c) => p + c.cartPrice * c.skuNum, 0);
    },
    totalNum() {
      return this.cartList
        .filter((item) => item.isChecked === 1)
        .reduce((p, c) => p + c.skuNum, 0);
    },
    allChecked: {
      get() {
        return (
          this.cartList.every((item) => item.isChecked === 1) &&
          this.cartList.length !== 0
        );
      },
      async set(isChecked) {
        try {
          //收集所有商品的id列表
          const skuIdList = this.cartList.map((item) => item.skuId);
          await changeAllChecked(isChecked ? 1 : 0, skuIdList);
          //如果成功则重新请求最新的数据
          this.getShopCartList();
        } catch (e) {
          alert(e.message);
        }
      },
    },
  },
};
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 4.1667%;
        }

        .cart-list-con2 {
          width: 25%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con3 {
          width: 20.8333%;

          .item-txt {
            text-align: center;
          }
        }

        .cart-list-con4 {
          width: 12.5%;
        }

        .cart-list-con5 {
          width: 12.5%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 12.5%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 12.5%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>
